Method of making coated pipes



Jan. 1, 1935. L H. WILSON METHOD OF'MAKING COATED PIPES 4 Sheets-Sheet 1Filed Oct. 11, 1952 I fmenlaf.

LORENZ HENEY VV/LSO/V,

Jan. 1 1935.

L. H. WILSON METHOD OF MAKING COATED PIPES Filed Oct. 11, 1932 4Sheets-Sheet 2 Jan. 1, 1935. 7 L, w o 1,986,696

METHOD OF MAKING COATED PIPES Filed Oct. 11, 1952 4 Sheets-Sheep 3AAAAAAAAAAAAA fmenfir:

- LORENZ HE /EY l V/L5ON,

Jan. 1, 1935. 1.. H. WILSON METHOD OF MAKING COATED PIPES Filed Oct. 11,1932 4 Sheets-Sheet 4 e M Lo/aE/vz HEN/Ev W/uao/v,

Patented Jan. 1; 1935 a r,

e 15 this invention fFigure1'3.

. through the coating nozzle. v v n l 25 i In carrying out the methodofthis invention, wrapping of paper, jfabric; metal foil or thelike 2530 -may be manually or mechanically delivered onto standardsprayapparatus may be substituted for 3511east212 degrees Fahrenheit :toremove any from which they are removedto an inspection 40 veyenD whichwill turn move the" pipes 01 outside coat. The material'for the primingcoat NITE PA T OFF CE p q; ,.1\m'rnon OFMAKINGCOATEDP'IPES Lorenz HenryWilson, McKeesp0rt, Pa, assignor to National Tube Company, a corporationof New .lersey p v 3 Application October 11, 1932; seriai ndfcetsss"lClainis; (o1. s s) i This invention relates to the manufacture ofcompositionwill be extruded around the tube or coated pipes, and moreparticularly to asphalt pipe: ofa predetermined thickness. Thisheavycoatedpipes and a method of applying said plastic'asphalt Comp s tioncoating is, tfi coating to preformed metal pipesa', i I to be suppliedtoithe extrusion nozzleGfrom a One object-of the present invention'is topropair of duplicate melting tanks or cookers 3, to 5 videa methodofmechanically applying asphalt be described. 'I'heextrusionnozzle G willalso coatingto pipes by extr ding the coating upon behereinafterdescribed more in detail. the pipe's. i T I 1 r i Y From theextrusion-nozzle G the heavily coated 1 Another object is to provide amethod whereb 0 pipes w p immediately Onto bycoatings ofvaryingthicknesses may berapgoing rollertype conveyer table ,Hwhich is pro- 10idlyapplied to preformedfmetal'pipes. I i .yid'ed with a'spray pipe Jarranged above thetable Inthe drawings: v andwhichis adaptedto sprayfreshly coatedtubes Figure 1 is a plan view of apparatushused in'oripipeswith water or other fluid or finely pulvercoating: pipe inaccordancewith the method of ized materials to set and harden theasphalt coat- I; r i l =-Whenffinely pulverized materials are used,

Figure 2 is a sideelevation thereof. i "suchas cement dust, they willadhere to the coat- Figure3 is an enlargediplan of the'coating apingandserve to assist in protectingthe coating paratus per se. it it :1 L 1from the sunsrays. a i j t Figure 4 is a side elevation of the apparatusAfter1,the coated tubes or pipes are passed along I r i J I thetableHytoqitsouter-terminal they will be LFigure 5 is'a-sectionalelevationtaken *onthe transferred over the, skids 5 onto a third roller 7 dine VVof Figure 315 11 1 s i conveyer table LQand will be'moved'by the rollerv Figure 6 is an I enlarged sectional" elevation conveyer table Lthrough a standard wrapping .machineM which is adapted to apply -aspiral uncoatedblack or galvanizediron or steel pipes over the set andhardened asphalt composition Ior tubes, or any other article having'asymmetricoating, soas' to protect said coatingfromdanger, 1; cal shapefrom end to end; to jbe. coated lareiaseithermechanical or solar,occasioned whenthe sembled on areceiving table A fromwhich they pipe isintransit or in service. ,IfQdesired, any

y ya slow moving*mechanical1conveyereBc which the machine M, and lime orother coating in solupasses throughna furnace or oventCr L' The 'con-.tionmay be applied over the hardened asphalt.

veyer B will conveyrth'e pipes through'the Iur- 1 Thepipespr tubes passthrough the wrapping nace or oven C WhereLthey will be heated to atmachine M andfonto, a roller conveyer table N moistureior oil :and toprepare the pipe to retable Pt. v a i a ceivethe coatin i "f H i wTheasphaltcoating compoundused asaprim- T e c y B-Wi11 automaticallydeposit the wings coat maybe either, plain asphalt or asphalt heated andd d p p s or u sr t a l er 0011- with afillerof' silica,similar-to'thatused for the tubes p y Jat right angl s tU h i -PathO-isdeposite'd in the cooker ormelting tanku2, which travel through thefurnace. C and will feed the .is heated by suitable meanssuch as steamcoils, P p tubes n the bite pinch-rollers electrical heatingresistanceelements, direct fir-' The pinch-rollers 'E will in turnfeed the:pipesifig orjthe lik (not hown), i i

'45 or tubes into an extrusion nozzle F where a primi Theflasphalt inthe cooker 2 is heated until it ing: or flux o g w ppl T primbecomesmolten and is quite fluid. Then-itis ing or flux coatirig is composedofnaamolten as- ".pumpedtfrom the cookerzthrough; a conduitz phaltcompos tion which s pp 2 the nozzle to the priming extrusion nozzle F.:The priming F from a melting tank or cooker 2, whichwillbe lIlOZZ18.Fis compo ed of casting 10 having r 60 hereinafter described. The nozzleF will also be movable'port membersll and 12. The port mema 5 a heavyplastic coating ot asphalt or asphalt =ing to flow rearwardlyelong thepipe'or tube being T 1 hereinafter describedmorein detail.

her '11 is adaptedto snugly fit the pipe or tube to The pipes or tubesfpass immediately from the ibecoated, and is provided with a recess 14interpriming or coating nozzle -F through asecond lmediate itsoutsidelandzinside faces, which is coating nozzleG of the extrusion typewhere adapted to trap any ofthecoating materialtendv nozzle F.Suflicient head is provided to extrude the fluid coating through theport 12 and around I coated and to reduce the friction on the pipe.

The port member 12 is of slightly larger diameter than the. pipe or tubebeing coated so as to provide a clearance around the pipe or tube equalto the thickness of the priming coat desired. The casting 10 has aninternal diameter materially greater than the openings in the ports 11and 12 so as to provide a chamber. 15 adapted to contain a bodyof themolten arrd figidcoatingniaterial'usedinpriniing the pipe. An internalport 16 having a valve 17 is provided through which the fluid materialfrom the cooker 2 passes into the chamber 15 of the thepipej.;

The priming nozzle F has its port 12 connecting directly to the inletside of thecoating extrusion nozzle G. The nozzle G is*snueturau-yeeentim uation of the casting 10 and comprises a hollowcoating chamber 18 of materially greater diameter thaii-fthefla rgest'size pipe or tube'ad'apted'to be tested, hich -chamber is connected toits upper end. with aplas'tic coating "container or vessel Y towhich-the plastic composition is 'directedfrom thecpokeif 3. "A removameextrusionnozzle port 1'9issecuredfto the'outgoing end of thecoatingnozzle G, andthis nozzleport is'adapted to have an outlet opening of adiametensuch as will'l'imit the thicknss of the extruded'c'oating'tothat "desired." Suitable guideflugs '20 are provided in the nozzle'port1'9 t'o center an'd'g'uide the pipes passing thro'ughfthe saidnozzle'port.

i j'Th'e nozz1e'or and nozzle-port19 iare provided I ingj'the valve 30so as to" coldde'p'osit of the compositioni'rom said valve.

"with suitable coils through"which heating" 'or eemmg'me iums;asfdesiredjmay bep'a'ssed. In practice. the plastic seating material useto coat higher temperature than that"de's ired:or suit- "able rorextruding onto and around the'pipe; and "in this instancea'coolingniediumsuchas oil preferably passed 'or 'ei 'mate -through theiTheoil being circulated through the iiioils" 25 "1'5 preferabl passed'thTqHgh '2, bank of 'cooling'coils 26'at a'distane'e from the vessel Y,

and "is circulated from a stor'ageftank Q by "a Dumas. 1

- "If; "for anyre'aso'n, such asa breakdown or temporary suspension, theplastic-composition material should become cool or 'hardend the nozzleG; suitable} heating elements-35' o'f' any standard construction" areprovided in the tank Q v for heati ng the "oil to be ci'rculated throughf thefcoils '25, andsaid heated oil 'will becircu- "lateduntil theplastic material becomes "'sufiieiently molten to' pass out ofthe'nozzle A suitable drain or clean-out valve 30'- is'-p'rovide'd 'at "thelower side of the nozzle "G1 to'fpro- 'videffor"-'draining and cleaningout the nozzle W'hen"the operation of "the ap'paratusis to "bediscontinued. A' s'uitable source" ofcheat, "such aS' aburner 31,"-is'preferably provided 'for heatremove any cooled or The cookers or meltingtanks 3in which the 'plastic material for forming the coating is 'p'ref-"er'ably meltedmay be of f construction' adapted for melting an asphaltor "an "asphalt composition containing silica or any -other""=sui'tab1emineral :filler. The hco'oke'rsor any usual design and tanks? 3-as"shown are provided with-agitators 32 oper'ated 'by' motors "33vthroughsuitable "drive -c'onriections' 34; These agitators' 'areadaptedto izbef cohstantly operated "during the melting of the "asphalt-'composition'so :as to prevent'burning and separationiir'of theasph'alt end-silica. The

cookers or tanks 3 are connected by conduits or pipes 35 and 36 to amain pipe 39 which, in turn, connects with the storage vessel Y.

The coating material, as it is directed to the container or vessel Y,preferably is at a temperature of approximately 525 degrees Fahrenheitand, since this temperature is too high for proper extrusion itis,lowcred by the cooling efiect of 1 oil passingfthrough the "coils 25th approximately 350 degrees Fahrenheit to provide the properconsistency for extrusion upon and around the pipe or tube. It will beunderstood that the various materials require different extrudingtemperatures; therefore I do not wish to be "liiiiited' 'to'ithe abovetemperature.

By prope 'manipulation of the heating elements 35 and cooling coils 26the temperature of theoiliiowin g iiitothe coils 25 may be used toprovide a critical temperature of the coating to be extruded onto thepipe. Itwillyof course, be understood that other means than thec'oi'ls25 may be vprovided -for controllingthe temperature of the asphaltcomposition being extruded.

It will also be understood that if necessary or 1 5 desirablemechanicalmeans may-be provided 'for forcing the coating =material "out"of either the priming or coating nozzles, and that various otherchanges in the design and operation of the apparatusmay bemade tofacilitate the carrying out of the-several steps-of this invention.

It will also be understood that ='I do not Wish to belimit'edtethespecific steps of the-method -described, nor -to *the use of asphaltcoatings, since various other materials maybe-used and the steps ofthe-method may be modifiedwithin the "scope :of r" the appended olaimswithout departing from my invention.

1. The method of protecting the exterior surfaces -of r-rnetal pipeswhich? consists in heating said pipes to at least 212"degrees-Fahrenheit, applying a-thi'n priming" coat rof a moltencomposition of asphalt to ethe pipeflthen immediately thereafterapplying a heavy layer of plastic composition of-asphalti-over'saidpriming coat, then spraying "said coated p'i'pe with water to set "andharden fsaids-com'position, and finally: applying a 'layer of.protectivematerial i over said asp'halt,

S2.id last-named material being"non-destructive 5D extruding-5apriming-coat of a molten com- I position of'asphalt onto the heated.pipeythen immediately thereafter extruding a heavy :layer of a plastic"asphalt "composition onto the pipe over "said priming coat, and thenspraying "coa'ted" pipe with fluid or-fine1ypulverized "ma- 't'erialstoset andharden-the asphalt composition.

3. The-method "of "protecting the exterior :surfaces of metal 'pipes'which consists -'in heating said"; pipes-to "at least 212 degrees 7Fahrenheit, -extruding" a thin priming "coat of a molten composition ofeasphalt' 'onto thewheatedr pipe; then immediately thereafter extrudinga *heavy layer for a plastic asphaltcomposition onto the pipepver'saidprimingcoat; then-spraying said'coated pipe to set and rharden'the-asphalt composition, andsfinally' applying a iayer -of=protective"materialoverisaid asphalt said 'last named material "beingnow-destructive and 'non' softening at elefivatedtatmospherictemperatures.

"said P160 pipes, applying 1 I V V 1,986,696, awn-1e method ofprotecting the term which consists in heating a thin priming coat of afaces, of metal pipes harden said composition,

last named material being non-destructive, and

non-softening at elevated atmospheric tempera turesw 5.) The method ofprotecting the exterior surfaces of metal pipes which consists inheating-said a priming coat of flowable material to said pipe, thenextruding a heavy layer of plastic composition onto the primed pipe,allowing said plastic compositionto set and harden, and

finally applying a layer of protective material over said asphalt, saidlast named material'beingnondestructive and non-softening at elevatedatmos- 7 pheric temperatures. 9 I i 6. The method of protecting theexterior surfaces of metal articles such as pipes and the like whichconsists in heating degree that substantially all moisture will be driedfrom the article, applying a heavy layer of plastic composition ofasphalt over the article, then spraying the coated article with fluid orfinely pulverized materials to set and harden the coating ofjasphaltcomposition, and finallyl applying a layer of protective material oversaid asphalt, said last named material being non-destructive andnon-softening at elevated atmospheric temperatures" i r 7. The method ofprotecting the exterior surfaces of metal articles such as pipes and thelikev which consists in applying a priming coat of flow-- able materialto said article, then extruding the heavy layer of plastic compositiononto the primed article, allowing said. plastic composition to set andharden, and finally applying a layer of protective material over saidasphalt, said last named material being non-destructive and non-softeninat elevated atmospheric temperatures.

ORENZ HENRY WILSON.

said articles to such a

